Convert VRService client to use BrowserInterfaceBroker

This change converts VRService mojom interface client in blink
to use BrowserInterfaceBroker, and converts VRService{Ptr, Request}
in chrome, content and blink to the new Mojo type.

Bug: 936482, 955171, 978694
Change-Id: Ib2d982ea3402c570c825e2b55d7aec2c77b2d8c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828717
Commit-Queue: Miyoung Shin <[email protected]>
Reviewed-by: Oksana Zhuravlova <[email protected]>
Reviewed-by: Kent Tamura <[email protected]>
Reviewed-by: Kinuko Yasuda <[email protected]>
Reviewed-by: Klaus Weidner <[email protected]>
Cr-Commit-Position: refs/heads/master@{#702732}

resources/chromium/webxr-test.js

@@ -89,7 +89,7 @@ class MockVRService {
     this.runtimes_ = [];
 
     this.interceptor_ =
-        new MojoInterfaceInterceptor(device.mojom.VRService.name);
+        new MojoInterfaceInterceptor(device.mojom.VRService.name, "context", true);
     this.interceptor_.oninterfacerequest = e =>
         this.bindingSet_.addBinding(this, e.handle);
     this.interceptor_.start();